Normalize heading "Synchronize the users"

1. Use sentence-case

2. Don't be so wordy.  The paragraph explains this stuff - you don't need
to put the whole explanation into the TOC.

docs/backdrop/index.md

@@ -107,7 +107,7 @@ The installer will verify that you've downloaded the correct version of CiviCRM,
     * **view event participants** : Enable this permission to allow anonymous users to access participant listing pages for events.
 <!-- markdownlint-enable MD046 -->
 
-## Create CiviCRM Contacts for Existing Backdrop Users {:#contacts-users}
+## Synchronize the users {:#contacts-users}
 
 Once installed, CiviCRM keeps your Backdrop Users synchronized with corresponding CiviCRM contact records. The 'rule' is that there will be a matched contact record for each Backdrop user record. Conversely, only contacts who are authenticated users of your site will have corresponding Backdrop user records.
 

docs/drupal7/index.md

@@ -110,7 +110,8 @@ The installer will verify that you've downloaded the correct version of CiviCRM,
     * **view event info** and **register for events** : If you plan to use CiviEvent and want to allow un-authenticated visitors to view event information and register for events online - enable these permissions for the "anonymous" role.
     * **view event participants** : Enable this permission to allow anonymous users to access participant listing pages for events.
 <!-- markdownlint-enable MD046 -->
-## Create CiviCRM Contacts for Existing Drupal Users {:#contacts-users}
+
+## Synchronize the users {:#contacts-users}
 
 Once installed, CiviCRM keeps your Drupal Users synchronized with corresponding CiviCRM contact records. The 'rule' is that there will be a matched contact record for each Drupal user record. Conversely, only contacts who are authenticated users of your site will have corresponding Drupal user records.
 

docs/drupal8/index.md

@@ -182,7 +182,7 @@ cv core:install -vv --cms-base-url="URL" -m loadGenerated=1
     * **view event participants** : Enable this permission to allow anonymous users to access participant listing pages for events.
 <!-- markdownlint-enable MD046 -->
 
-## Create CiviCRM Contacts for Existing Drupal Users {:#contacts-users}
+## Synchronize the users {:#contacts-users}
 
 Once installed, CiviCRM keeps your Drupal Users synchronized with corresponding CiviCRM contact records. The 'rule' is that there will be a matched contact record for each Drupal user record. Conversely, only contacts who are authenticated users of your site will have corresponding Drupal user records.
 

docs/drupal9/index.md

@@ -177,7 +177,7 @@ Replace `cv` with the path to the cv phar on your system if applicable. The part
     * **view event participants** : Enable this permission to allow anonymous users to access participant listing pages for events.
 <!-- markdownlint-enable MD046 -->
 
-## Create CiviCRM Contacts for Existing Drupal Users {:#contacts-users}
+## Synchronize the users {:#contacts-users}
 
 Once installed, CiviCRM keeps your Drupal Users synchronized with corresponding CiviCRM contact records. The 'rule' is that there will be a matched contact record for each Drupal user record. Conversely, only contacts who are authenticated users of your site will have corresponding Drupal user records.
 

docs/joomla/index.md

@@ -35,7 +35,7 @@ Note: when installing a new version over an old one, please first check [trouble
 
     Note that missing PHP Zip functionality *will* prevent CiviCRM from installing extensions via the GUI.
 
-## Create CiviCRM Contacts for Existing Joomla Users {:#contacts-users}
+## Synchronize the users {:#contacts-users}
 
 Once installed, CiviCRM keeps your Joomla Users synchronized with corresponding CiviCRM contact records. The 'rule' is that there will be a matched contact record for each Joomla user record. Conversely, only contacts who are authenticated users of your site will have corresponding Joomla user records.
 

docs/wordpress/index.md

@@ -159,7 +159,7 @@ if (!defined('CIVICRM_CLEANURL')) {
 
 * Now Cleaner URLs will be enabled.  Enabling Cleaner URLs does not change how shortcodes work in CiviCRM and existing "Old" style URLs will still work
 
-## Create CiviCRM Contacts for Existing WordPress Users
+## Synchronize the users {:#contacts-users}
 
 Once installed, CiviCRM keeps your WordPress Users synchronized with corresponding CiviCRM contact records. The 'rule' is that there will be a matched contact record for each WordPress user record. Conversely, only contacts who are authenticated users of your site will have corresponding WordPress user records.